Knife-sharpener.



APPL

R. J. DEARBORN. KNIFE SHARPENER.

IGATION FILED TEB.23, 1911.

Patented Jan. 16, 1912.

` which RICHARD J'. DEARBORN, OF BEVERLY,

FFlE.

MASSACHUSETTS, ASSIGNOR OF ONE- HALF TO CHARLES B. DEAN, OF BOSTON,MASSACHUSETTS.

KNIFE-SHARPENER.

Specification of Letters Patent.

Patented J an. 16, 1912.

Application led February 23, 1911. Serial N 0.610,318.

To all whom t may concern:

Be it known that I, RICHARD J. DEARBORN, of Beverly1 in the county ofEssex and State of Massachusetts, have invented certain new and usefulImprovements in Knife-Sharpeners, of which the following is aspecification.

This invention relates to a knife sharpener "having two circularsharpening members located side by side and provided with peripheralridges or projections formed as metal planing cutters, the members beingin contact with each other so that portions of said vcutters constitutethe sides of a tapering recess between' the members through a knifeblade is yadapted to be moved longitudinally,.such movemeiit of theblade causing the cutters to exert a planing action 0n the oppositesides `of the blade at and above the cutting edge formed by theirintersection.

The object of the invention is to provide a simple, durable andeffective sharpener of this character, the sharpening members of whicharel so confined that they may be rotatively vadjusted to bring theirdiffer-` ent ortions into operative position.

T e invention consists inthe improve` ments which I will now proceed todescribe andclaim.

Of the accompanying drawings which form a part of thisspeciication:;Figure 1 represents a plan view of a Sharpener embodyingmy invention; Fig. 2 representsa side view of the same Fig..3 representsa section on line 3 3 of Fig. 1; Fig. 4 represents a side view showingthe cutting members on a larger scale. Fig. 5 represents a view similarto Fig. 4 showing the central portions of the sharpening members ofgreater-diameter than their end .port-ions; Fig. 6 represents a sectionon lineG-G of Fig. 4:; Fig. 7 represents al view similar to Fig.' 6showing a modification.

Similar reference characters indicate the same or similar parts in allthe figures.

In the drawings, 12, 12 represent a pair of cutting members of hardenedsteel, each being of circular form in cross'section and preferably madeof a single piece which may be hollow or tubular, as shown by Fig. 3.The periphery of each member is grooved to form a plurality ofperipheral cutting edges 13 adapted to actas metal planing cutters inremoving minute shavings of ma- ',The formation of the ened. Theabutment 21 may terial from opposite sides of a knife blade 14, the edgeof which is inserted in the recess formed by the adjacent portions ofthe members, as indicated edge 13 is preferably formed by theintersection of a face 15 which is in a plane substantiallyI at rightangles with the axis of the member 12 and a face 16 which isfrustoconical and inclined relatively to said axis. intersecting sideswhich form the cutting edges 13 may, howe ever, be different from thatshown and each of said faces may be inclined relatively to the axis ofthe member on which it is formed if desired.

The members 12 are coniined loosely side by side in a holder havingmeans for preventing removal of the members in any direction and formedto permit the insertion of a knife edge between them and a movement ofsaid edge in a direction parallel with the axes of the members. Theholder here shown comprises a base 1T, a fixed abutment 19 having aninclined inner face 19 on which 011e side of one of the members 12bears, and a fixed abutment 21 having an inclined inner face 21a, saidfaces 19a and 2 1a forming two sides of a chamber in which t-hesharpening members are located. The inclination of the faces 19a and 21aand the distance between them, are such that the sharpening member'sareheld in contact with each by the said faces when dropped into thechamber, the members being loosely confined so that each is free to turnand to adjust itself to the blade which is being sharpbe provided with ascrew 22 adapted to bear against the outer side of 011e of the members12. vSaid screw is not intended to clamp the members rigidly, its objectbeingto compensate for any imperfections or variations in the diameterof the members, and insure a light but not a binding contact with eachother and at the same time allow each a certain freedom of movement. sothat the members may adjust themselves to the blade, and are free to bepartially rotated to bring fresh parts of their cutters into operativeposition. The screw 22 may be omitted if desired. The holder is providedwith a hood 23 which is detachably secured by a screw 24 to the base 17and is bent to extend across t-he ends and the upper portions of themembers 12, thus preventing endwise and outby Fig. 3. Each cutting 'Wardremoval of said members, the hood forming the top and ends of thechamber whereof the abutments 19-21 form the ends. The hood is providedwith a recess or opening 25 Which is formed to expose the actingportions of the cutters and permit the longitudinal movement of a knifeblade between the same. The base and hood constitute a chambered holder,the parts'whereof are separable. The base 17 may be adapted forattachment to a table or other support, or it may be provided With ahandle 26 adapted to be grasped by one hand of the operator.

The members 12 are arranged so their cutters 13 slightly overlap andalternate, as indicated by Figs. 1, 4, and 5. Fig. 5 shows the membersof slightly greater diameter at their central portions than at theirends. While I prefer to make .each member 12 in one piece, as indicatedby Fig. 6, it may be made of a number of separate pieces located side byside, as indicated by Fig. 7, each piece being separable from theothers. The cutters constitute parallel ridges on the surfaces of thesharpening members, and as shown by Fig. 5, each ridge is endless and isindependent of the others. It is obvious, however, that the cutters ofeach member may be the convolutions of a helical ridge, instead of beingformed by independent endless ridges.

I claim 1. A .knife Sharpener comprising a holder composed of separableparts forming a chamber, one of said parts having a knifereceivingopening communicating With the chamber, and a pair of circularsharpening members loosely depositedin said chamber and confined againstdisplacement by the 40 Walls thereof, the members being held in contactWith each other by opposite sides of the chamber, and each having aplurality'of peripheral planing cutters.

2. A knife Sharpener comprising a base having fixed abutments Whichformopposite sides of a chamber, a pair of circular sharpening membersloosely deposited side by side in said chamber, said members bearing attheir outer sides on said abutments and beingV held by the abutments incontact With each other, each member having a plurality of peripheralplaning cutters, and a detachable hood completing said chamber andadapted to prevent removal of the cut-"

